AS568 standard size, dash -458
AS568-458 O-ring: 14.475 in ID x 0.275 in cross-section
AS568-458 is the AS568 dash 458 O-ring size. It has a 14.475 in (367.67 mm) inside diameter and a 0.275 in (6.99 mm) cross-section, which gives a 15.025 in (381.65 mm) outside diameter as a reference. AS568 controls the inside diameter and the cross-section; the outside diameter is derived.
- Inside diameter
- 14.475 in367.67 mm, +/- 0.070 in
- Cross-section
- 0.275 in6.99 mm, +/- 0.006 in
- Outside diameter
- 15.025 in381.65 mm, reference
- Series
- 4xx0.275 in nominal cord
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Specifications
| Dimension | Value | Tolerance |
|---|---|---|
| Inside diameter (ID) | 14.475 in 367.67 mm | +/- 0.070 in |
| Cross-section (W) | 0.275 in 6.99 mm | +/- 0.006 in |
| Outside diameter (reference) | 15.025 in 381.65 mm | derived: ID + 2 x W |
| Standard | AS568 (SAE Aerospace Standard) | inch authoritative |
Millimeter values are converted. Groove dimensions and squeeze follow the gland standard your drawing names (SAE AS4716, AS5857 or ISO 3601-2), and material engineering follows the compound sheet.
Source for the dimensions and tolerances on this page and the nearby sizes: Parker® O-Ring Handbook ORD 5700, 2021 printing, section IX, AS568 size tables, pages 9-2 to 9-11, read 2026-09-27. Inch values are authoritative and millimeters are converted at 25.4.
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Cross-reference
Mil-spec and AMS callouts for AS568-458
AS568-458 is the dash number the military and SAE part standards below use for this same nominal size. The document sets the compound; the dash sets the nominal dimensions.
| Designator | Document | Compound | Status | Back-up ring |
|---|---|---|---|---|
| MS28775-458 | MIL-PRF-25732 (MS28775 part drawing); now SAE AS28775 | NBR | Inactive (MIL-PRF-25732); AS28775A current (revised 2008, reaffirmed 2025) | see drawing |
| M83461/1-458 | MIL-P-83461/1; superseded by SAE AMS-P-83461/1, then by SAE AS83461/1 | NBR | Canceled (MIL-P-83461/1); AS83461/1C current (revised 2016, reaffirmed 2021) | see drawing |
| M83248/1-458 | MIL-R-83248/1 (Class 1); DoD cancelled it in 2008 and pointed future purchases to SAE AS3209 (AMS7276) | FKM | Canceled (MIL-R-83248/1); AS3209C stabilized (2021); AS83248/1A current (revised 2016, reaffirmed 2021) | see drawing |
| M83248/2-458 | MIL-R-83248/2 (Class 2); now SAE AS3581 (AMS7259) | FKM | Canceled (MIL-R-83248/2); AS3581A stabilized (2020); AS83248/2A current (revised 2016, reaffirmed 2021) | see drawing |
| AS3209-458 | SAE AS3209 (AMS7276) | FKM | AS3209C stabilized (2021) | see drawing |
| M83485/1-458 | MIL-R-83485; O-ring sheet MIL-R-83485/1 superseded by SAE AMS-R-83485/1; SAE cancelled it in June 2015 (AMSR83485/1A) | FKM, low-temperature grade | Canceled (MIL-R-83485) | see drawing |
| M25988/1-458 | MIL-DTL-25988/1; parallel SAE AMS-R-25988 | FVMQ | Active (MIL-DTL-25988/1); AMSR25988B current (2023) | see drawing |
| M25988/2-458 | MIL-DTL-25988/2; parallel SAE AMS-R-25988 | FVMQ | Active (MIL-DTL-25988/2); AMSR25988B current (2023) | see drawing |
| M25988/3-458 | MIL-DTL-25988/3; parallel SAE AMS-R-25988 | FVMQ | Active (MIL-DTL-25988/3); AMSR25988B current (2023) | see drawing |
| M25988/4-458 | MIL-DTL-25988/4; parallel SAE AMS-R-25988 | FVMQ | Active (MIL-DTL-25988/4); AMSR25988B current (2023) | see drawing |
| MS29513-458 | MIL-P-5315 (MS29513 part drawing); now SAE AS29513 (AMS-P-5315) | NBR | Canceled (MIL-P-5315); AS29513C current (revised 2016, reaffirmed 2021) | see drawing |
| AS3582-458 | SAE AS3582 (AMS3304) | VMQ silicone | AS3582 current (reaffirmed 2018) | see drawing |
| AS9386-458 | SAE AS9386 (AMS7267) | VMQ silicone | AS9386B current (2021) | see drawing |
| 4458 | X-ring on the AS568 size (the 4 prefix plus the dash) | any compound | numbering convention | see drawing |
Document statuses are read from DLA ASSIST and SAE Mobilus (read 2026-09-24 and 2026-09-25, with SAE's current-revision records read 2026-09-27). This table carries no durometer; the document sets it.
To quote it, send the designator exactly as the print reads, with its revision and any suffix letter. Parts are supplied against the document named and quoted in the compound the print calls out.
- The MS28775 Revision E sheet (1984-03-23), the DoD drawing behind the MS28775 part numbers, lists -458 at the AS568-458 nominal size, and it holds the inside-diameter tolerance tighter than AS568 above 0.500 in ID. DoD canceled the drawing on 2000-09-29, and SAE-AS28775 superseded it with the same part numbers (DLA ASSIST ident 41724, read 2026-10-04). Your drawing governs.
- DLA ASSIST records MIL-P-83461/1 as canceled on 2003-10-01 and superseded by SAE-AMS-P-83461/1, and DoD's adoption of SAE-AMS-P-83461/1 as withdrawn on 2010-01-20, superseded by SAE-AS83461/1 (DLA ASSIST idents 33814, read 2026-09-24, and 213939, read 2026-09-25).
- DoD cancelled MIL-R-83248/1, the slash sheet behind the M83248/1 part numbers, on 2008-07-24 and pointed future purchases to SAE AS3209, with the boss sizes (M83248/1-901 to -932) to SAE AS3208; SAE later issued AS83248/1, O-ring molded from AMS7276 material, in December 2014, and DoD adopted it on 2025-11-03 (DLA ASSIST: MIL-R-83248/1A Notice 5, read 2026-09-29, and ident 286630, read 2026-09-25; SAE Mobilus AS83248/1A, read 2026-09-27).
- The records name two SAE documents for MIL-R-83248/2: DLA ASSIST records it as canceled on 2004-01-22 and superseded by SAE-AS3581 and SAE-AMS7259, and AS3581's current revision, AS3581A, was stabilized in May 2020; SAE also issued AS83248/2, O-ring molded from AMS7259 material, in December 2014, and its current revision, AS83248/2A (revised October 2016, reaffirmed November 2021), was adopted by DoD on 2025-11-03 (DLA ASSIST idents 33575 and 286631, SAE Mobilus AS3581A and AS83248/2A, all read 2026-09-28).
- M83485/1 is a low-temperature fluorocarbon, not a fluorosilicone; one manufacturer's aerospace cross-reference (Freudenberg, July 2024, read 2026-09-27) lists it against AMS7287. Both SAE successors DLA ASSIST names are cancelled: it records MIL-R-83485 and its O-ring sheet, MIL-R-83485/1, as canceled on 2002-10-23 and superseded by SAE-AMS-R-83485 and SAE-AMS-R-83485/1 (idents 33839 and 33840, read 2026-09-28), and SAE cancelled AMS-R-83485 in May 2014 (AMSR83485A) and AMS-R-83485/1 in June 2015 (AMSR83485/1A) (SAE Mobilus, read 2026-09-27 and 2026-09-28).
- The M25988 slash sheet carries the class and grade; the base document carries the qualification list. The slash sheets are Active; the base MIL-DTL-25988D was noted inactive for new design on 2025-06-11 and in part superseded by SAE AMS-R-25988, which SAE had cancelled in August 2017 (DoD withdrew its adoption on 2018-01-02) and reissued as revision B in June 2023 (DLA ASSIST, read 2026-09-24 and 2026-09-28; SAE Mobilus, read 2026-09-27).
- The MS29513 Revision C sheet (1966-09-16), the DoD drawing behind the MS29513 part numbers, lists -458 at the AS568-458 nominal size, and it holds the inside-diameter tolerance tighter than AS568 above 0.500 in ID. DoD canceled the drawing on 2001-03-01, and SAE-AS29513 superseded it with the same part numbers (DLA ASSIST ident 41788, read 2026-09-27). Your drawing governs.
- One manufacturer's aerospace cross-reference (Freudenberg, July 2024, read 2026-09-27) lists MS9068 against AMS3304 and holds its parts over 0.500 in ID to a tight tolerance; MS9068's document status is not verified here.
- The MS9386 Revision B sheet (1975-01-17), the DoD drawing behind the AS9386 part numbers, lists -458 at the AS568-458 nominal size, and it holds the inside-diameter tolerance tighter than AS568 above 0.500 in ID. DoD canceled the drawing on 1999-10-15, and SAE-AS9386 superseded it with the same part numbers (DLA ASSIST ident 37861, read 2026-09-27). Your drawing governs.
- Minnesota Rubber and Plastics numbers its Quad-Ring® sizes Q4 plus the AS568 dash (Groove Design: Quad-Ring Brand Seals, the starting-dimensions table); availability by dash follows that table.
Gland design
Groove guidance for a 0.275 in cross-section
Groove dimensions for this cross-section are not tabulated here. SAE AS4716 (static and dynamic) and AS5857 (static) set the glands for AS568 sizes, and ISO 3601-2 sets them for metric hardware; the groove design guide explains squeeze, stretch and gland fill, and your drawing governs.
Compounds for an AS568-458 O-ring
| Family | Standard range | Typical media |
|---|---|---|
| Viton® (FKM) | -26 C to 204 C | fuels, oils, heat |
| Buna-N (NBR) | -34 C to 100 C | mineral oils, hydraulic fluid |
| EPDM (EPDM) | -57 C to 150 C | water, steam, glycol; never petroleum oils |
| Silicone (VMQ) | -54 C to 204 C | dry heat and cold, static service |
| FFKM (FFKM) | -26 C to 320 C | aggressive chemistry and temperature beyond FKM (FFKM vs FKM) |
| HNBR (HNBR) | -32 C to 149 C | oil with heat |
| Fluorosilicone (FVMQ) | -73 C to 177 C | fuels at low temperature |
| Polyurethane (AU/EU) | -40 C to 82 C | abrasion and high pressure |
| Aflas® (FEPM) | -9 C to 232 C | steam, amines, sour gas |
| Butyl (IIR) | -59 C to 121 C | gas impermeability, brake fluid and phosphate esters; never oil |
| Polyacrylate (ACM) | -21 C to 177 C | hot transmission oil; poor at low temperature and in water |
| Ethylene-acrylic (AEM) | -40 C to 149 C | hot automotive oil |
| SBR (SBR) | -46 C to 100 C | the compound sheet governs |
| Natural rubber (NR) | -50 C to 70 C | the compound sheet governs |
| Epichlorohydrin (ECO) | -40 C to 135 C | the compound sheet governs |
The compound sheet sets the limit for a specific grade. The butyl, polyacrylate and ethylene-acrylic ranges are the handbook's section 2.2 figures (Parker ORD 5700, read 2026-09-14); the SBR and natural rubber (both dry heat) and epichlorohydrin ranges are Apple Rubber's printed standard-compound figures (Apple Rubber Seal Design Guide, read 2026-09-27). Name the compound your drawing calls out and we quote AS568-458 in it.
Viton® is a trademark of The Chemours Company; Aflas® is a trademark of AGC; Parker® is a trademark of Parker Hannifin Corporation; Quad-Ring® is a trademark of Trelleborg Sealing Solutions US, Inc.. No affiliation or endorsement is implied.
Nearby sizes in the 4xx series
| Dash | ID in | ID mm | W in | W mm |
|---|---|---|---|---|
| AS568-455 | 12.975 | 329.57 | 0.275 | 6.99 |
| AS568-456 | 13.475 | 342.27 | 0.275 | 6.99 |
| AS568-457 | 13.975 | 354.97 | 0.275 | 6.99 |
| AS568-458 | 14.475 | 367.67 | 0.275 | 6.99 |
| AS568-459 | 14.975 | 380.37 | 0.275 | 6.99 |
| AS568-460 | 15.475 | 393.07 | 0.275 | 6.99 |
| AS568-461 | 15.955 | 405.26 | 0.275 | 6.99 |
Nearby sizes from the same Parker ORD 5700 section IX AS568 tables as the dimensions above.
Frequently asked
What are the dimensions of an AS568-458 O-ring?
AS568-458 has a 14.475 in (367.67 mm) inside diameter with a 0.275 in (6.99 mm) cross-section, which gives a 15.025 in (381.65 mm) outside diameter as a reference. AS568 controls the inside diameter and the cross-section; the outside diameter is derived.
What tolerance applies to AS568-458?
The inside diameter carries plus or minus 0.070 in (1.78 mm) and the cross-section plus or minus 0.006 in (0.15 mm). Both come from the AS568 table for this dash number.
Which compounds is AS568-458 available in?
The compound your drawing or specification calls out. The families below show published ranges; the compound sheet sets the limit. Send the compound and we quote the size in it.
Which mil-spec part numbers share the AS568-458 size?
MS28775-458, M83461/1-458, M83248/1-458, M83248/2-458, AS3209-458, M83485/1-458, M25988/1-458, M25988/2-458, M25988/3-458, M25988/4-458, MS29513-458, AS3582-458, AS9386-458 all call out the AS568-458 nominal dimensions; each document sets its own compound and hardness class. The X-ring on this size is numbered 4458. Send the designator exactly as the print reads and we quote against that document.
Orders are handled under Conquest Seal's AS9100D quality management system, whose certificate scope includes distribution.
Need AS568-458 in a specific compound or quantity?
Send the part number, the material and the quantity. A Conquest representative reads every request and replies within one business day.
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